knowles



Jan. 15, 1929. 1,699,147

A. F. KNOWLES EXTEus'ioN PIPE sLEEvE F 10d lay 12, 1928 "'1'? E H m1 mil!!!" l!!l!!!!!!!1: 1a

a z I NVENTOR T ARTHUR E KNOWLES I TTOIIIIEY Patented Jan. 15, 1929.

UNITED STATES ARTHUR I. KNOWLES, OF UPPER MONTOLAIR, NEW JERSEY.

EXTENSION PIPE SLEEVE.

Application filed May 12, 1928. Serial No. 277,377.

The invention relates to sleeves or thimbles adapted to be imbedded in concrete, cement or other floors or walls to receive steam heating, water or other pipes extending through such floors, and the object of the invention is primarily to provide an adjustable sleeve adapted to serve with floors or walls of various thicknesses, which shall be easily adjusted. as to length, efficient and inexpensive, and a further object is to provide ornamental escutcheons or collars adapted to encircle the inclosed pipe and conceal the ends of the sleeve on both the upper and lower faces of the floor, or in face of walls, covering the space between the pipe and sleeve and easily and reliably engaged and held by the latter.

The invention consists in certain novel features of construction and arrangement of parts by which the above objects are attained, to be hereinafter described and claimed.

The accompanying drawings show the in vention as it has been carried out in practice.

Figure 1 is a vertical section through a portion of floor, showing the pipe in elevation and the sleeve and its collars in vertical section and partial elevation.

Figure 2 is a corresponding sectional view of the lower collar alone.

Figure 3 is aplan or top view of such lower collar alone.

Similar reference numerals indicate the same parts in all the figures.

The improved sleeve comprises a plurality of tubular sections of thin metal formed with continuous integral screwthreads produced by suitable spinning machinery, of uniform pitch but slightly different diameters so that one section may be screwed into the other and thus form a sleeve of the desired length. In the drawing the upper section 5 is thus received in the lower section 6. In making the floor the lower section 6 is supported on the fioor-form, not shown, with its lower end resting thereon and the upper end of the upper section 5 projecting sli htly above the plane of the floor. The concrete or cement is then poured and rammed as usual to form the floor 7 with the sleeve sections 5 and 6 firmly imbcdded therein.

The pipe 8 is of less diameter than the sleeve and extends vertically therethrongh and through the collars or escutcheons serving to cover the ends of the sleeve and prothe adjacent face of the floor.

vide an ornamental finish for the pipe abovew and below the fioor. Each collar is preferably of sheet metal in annular form slipped upon the pipe as the installation proceeds. Both collars are similar,each having an ornamental shoulderll immediately adja-{H cent the pipe-opening 12, and each has a flange 13 extending horizontally and terminating in an annular skirt 14. of larger diameter than the sleeve. The skirt 140i" the upper collar isdeep enough to accommodate at: the projecting upper endof the sleeve, section 5 while the skirt 15 of the lower collar may be of less depth, as shown. a y f Spaced on the inner face of each flange 13, preferably at opposite points, are two fixed spring arms 16 16 having outwardly curved convex ends 17 adapted to engage the screwthreads of the respective sleeve-sections 5 and 6 and hold the collars reliabl in place. One arm of each pair, marked 16 is longer" than the other, as shown in Figure 2, so thatthe arms of each pair will engage the threads of the screw on opposite points on the interior of the sleeve sections while maintaining flush contact of the collar with The'spring arms are glven a normally out ward set and are inserted by forcing them inwardly and thrusting them into the o n ends of the sections in which they are t us engaged frictionally, and then the collars are drawn into position above and below the floor 6 by a screwing movement induced by rotating the collars as willbe understood. By this arrangement the collars are held reliably in place on the pipe and in close contact with both faces of the floor without requiring other fastening means such as set screws or the like.

By properly proportioning the sections 5 and 6 as to length, they may be adjusted to serve with floors of w dely differing thicknesses within their range, and for floors beyond such range an additional section, not shown, may be screwed into either thus increasing the sleeve length as desired.

The projecting upper end of the upper section 5 serves to prevent the entrance of water to the sleeve in floor cleansing or like operations. Importance is attached to this feature as providing a waterproof connec tion in situations where open sprinkler heads are to be installed.

The device thus constructed offers the advantage of a wide range of adjustabillty,

thus avoiding the necessity of providing single sleeves in various cut lengths, and the corrugations produced by the formation of the screvvthreads impart a quality of stiff resistance to distortion especially desirable in concrete construction, and the-collars ar separably but strongly held in position Without exteriorly projecting fastening means.

I claim i 1. The sleeve described comprising a sheet metal tubular section having screwthreads formed integral therewith and extending throughout its entire length, a collar adapted to encircle a pipe received in such section, and means on the interior of said collar for engaging such threads and holding said collar to said section.

2. The adjustable sleeve described comprising a plurality of tubular sections of sheet metal each section having screwthreads formed integral therewith and extending throughout its entire length, and adapted to be screwed one into the other, a collar at each end of said sleeve adapted to encircle a pipe received in said sections, and means on the interior of each collar for engaging the threads of its respective section and holding such collar thereto.

3. A device of the character set forth comprising a tubular sleeve having internal screwthreads, a collar adapted to encircle a pipe received in such sleeve, and arms Within said collar adapted to engage said screwthreads. 7 p

4. A device of the character set forth comprising a tubular sleeve having internal screvvthreads, a collar adapted to encircle a pipe received in such sleeve, and spaced spring arms Within said collar adapted to engage said screwthreads, said arms tending When free to spring outwardly and having ends shaped to match said screwthreads.

5. A device of the character set forth C0111- prising a tubular sleeve having internal screwthreads, a collar adapted to encircle a pipe received in such sleeve, and spaced spring arms Within said collar adapted to engage said screwthreads, said arms tending when free to spring outwardly and differing in length to conform to the circumferential advance of said screwthreads at the points of contact of the ends of said arms, and the latter shaped to match said screwthreads.

6. The sleeve described comprising a sheet metal tubular section having circumferential corrugations formed integral therewith, a collar adapted to encircle a pipe received in such section, and means on said collar for engaging such corrugations and holding said collar to said section.

7. The sleeve described comprising a sheet metal tubular section having circumferential corrugations formed integrally tl'ierewith, adapted to be placed in a floor with its upper end projecting above the upper face of such floor, and a collar adapted to encircle a pipe received in such section and cover such projecting upper end, and means for holding said collar in engagement With said section.

In testimony that I claim the invention above set forth, I afiix my signature hereto.

ARTHUR F. KNOlVLES. 

